A miss is as good as a mile

Chinese characters comprise of many radicals and strokes which must be arranged in a particular geometric relationship to form characters.  A slight variation in the way these radicals or strokes are arranged can make them different characters altogether.

Here are some of the examples :

「日」vs.「曰」

「日」vs.「旦」

「旦」vs.「但」

「木」vs.「林」

「帽」vs.「冒」